キハダ,メバチ,クロカワのカロリン,マーシャル諸島付近における游泳層の季節変化について―IV

水温の深浅別季節変化

抄録

The author studied the seasonal variations in water temperature at various depths and sub-regions in the area of Caroline and Marshall Islands. The seasonal variation in the water temperature at surface and 50 meters in depth was found to be different from those of 150, 200 and 300 meters in depth. In the earlier period of the year the water temperatures at surface and 50 meters in depth were lower than those of the latter period but the water temperatures at the other deeper layers in the earlier period were higher than those of the latter period of the year.